Pneumatic valve



lMay 15, 1923.

H. P. KRAFT PNEUMATIC VALVE original Filed sept. 2, 1915 INVENTOR i@ K WITNESSES {WM By Attorneys,

AMM @uA/f2 d' Patented May 15, i923.

Application med september 2, 1915, serial"Monaci?.V Reineva myae, 1922, sriaiii. 'saa To all 11i/om t may concer/1i.'

Be it known that I, HENRY P. KRAFT, a citizen of the United States of America, residing at Ridgewood, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Pneumatic Valves, of which the following is aspeciiication. y f

This invention relates to air valvessucli as are used for pneumaticytires. I

Such valves have a tubular outer'shell or casing which atitsbase portion is'y attached yin any suitable mannerjto the tire, andwhich atits outer or exposed portion` is lformed with a neck within which is introducedfa plug or seat member against` which the valve proper or check seats outwardly; To ineke an air-tight,jointbetween the seat member and neck, the latter is commonly formed with a coned inner' seating face, and the seat member `has a groove in which is seated a packing'v ring or gasket which yas the member is forced rdown into place is compressed against such conedv seat. For forcing down theseat member a-screw plug is provided, preferably made separately from the seat member and swiveled thereto, so that when' withdrawn it pulls the seat member out. This screw plug engages internal screwthreads within the upper part ofthe bearing above the coned seat.

The present invention. provides for making a tight joint between the screw plug and the neck portionv of the valve casing, whereby to prevent out-leaking of air during ythe operation of pumping up the tire. l

The screw plug has a head which projects beyond the rim of the casing, and is knurled so that the screw plug may be grasped by the fingers and screwed `in byv hand. The screwl plug has a groove or neck between such knurled head .and its threaded body, and in this neck the packing ring o r gasket is seated.

Fig. l of the accompanying drawingsis a vertical mid-section of atire valve constructed according to this invention;

Fig. 2 is an end view or plan of Fig. l;

Figg is an elevation ofthe seat member and screw plug removed; Fig. 4f is an inverted plan of Fig. 3.

, Fig. 5 is a fragmentary section showing a p umpconnectionapplied to the valve.

Referringto the drawings, A is the outer shell or casing of the tire valve, the lower part of Whichis constructed inany of the well knownvways yfor.adapting,it for at- I ta'climent to a tire or inner tube.` The form lshown is a so-called cot valve, but'this is illustrated simply for! convenience. 'The easing eh'as as usual atitsouter or lupper end exterior "screwthreadsfdf for receiving the pump vconnection in' pumping up, or a valve clap thereafter, and has the usual internal threads Z) for receiving the finternallfsc'rew plug B which` has `lcorresponding external threads 01:; The' casing hasjalso La lco'ned or -tapered internal seat d. YThe seat mem- ,bei-.VC isyforced down byscrewiiig in the plug B. The member-1C yis shown ascenstruc-ted inxthe usual` man-ner 'with afseat e ati ,its lower end and; with afgroovef or lreduced neck abovefthis in which iscon; fined a Ipacking Vring or. gasket ,fi-.which seats `tightly within thegtapered rsea'tdl' The screw plug hasfits lower end. swiveled'toy the -seat member in the manner well understood, fand as `clearly shown' in'Figl.A Within the casing is-theusual valve proper. or checkD, which isfshown as mounted on a valve stem or pin Ewhichzpasses through the seat member and plugfitsf'upper end E serving asfa deflating pin., -Thelowerv-endgof the `pin`E is headed beneath the u sualstopfcup. gjwhich serves as an abutment; for the spring F which presses the checkfl) tup' againsttlie seat e. So far as described the construction is that which is common in the'zgwell yknown Schrader tire valve. L The construction shown and described may be `modified in any of the well known ways.v v The casing A at its upper endjis counter bored to form a tapered inner seating I'face kabove its internal screwthreads b; jThe screw plug B is turned down to form neck z which receives a packing ring j. which when in place seats yagainst the seat it. `The screw plug yhas at its outer end a head /c ywhich when the plug isrin'place protrudes beyond the end of the casing, and this head is knurled orroughened in any suitable way, so that when grasped by the fingers it may be used to screw inthe plug.

The seats f ,71, and packings-ol j are so rev lated ,that when*y the screw plugA has been screwed in far enough to force the seat member firmly into place yso as to forman air-l tight lit at the packing CZ', the upper packing j'shall similarly make an air-tight lit. The. purpose of this upper' packing is to prevent leakage of air between the screw plug and casing during the operation ot pumping up the tire. For this purpose it is su'liicient if the pump connection makes a tight joint with the top of the head le. rllhe head is internally counterbored so as to torni an annular chamber Z surrounding the detlating pin E.

This will be better understood :trom Fig. 5, which shows the pump connection G screwed on with its packing ring or gasket m pressing down against the top ci" the head /c ot' the plug so as to make an air-tight joint therewith.

lt will be understood that the shape and form ot' the respective packings and packing laces may be varied in any of the well known ways; also that those portions of the construction which are not novelmay be substituted by any known equivalents.

I claim as my invention l. A valve comprising a casing having an externally and internally threaded neck portion and an internal seating face, a seat member comprising a plug wholly enclosed within said casing and having a packing litting said seating tace, and an independently rotatable screw. plug swivelled to said seat member` abovek the latter, and having threads adapted to` engage the internal threads of the neck portion yand force the seat member into place, said screw plug having a head projecting above the casing when the seat member is in place, and constituting a manipulating member for insertving and removing the plugs by hand, the head oi the plug projecting only slightly above the top of the casing and being ot less diameter than the latter, whereby the external threads ot the neck may receive a pump coupling which encloses said head, the latter being adapted to make contact with the packing ot' said coupling.

2. A valve comprising a casing having an externally and internally threaded neck portion and an internal seating tace, a seat member comprising a plug wholly enclosed within said 'casing and having a packing Fitting said seating face, and an independently rotatable screw plug swivelled to said seat-member above the latter, and having threads adapted to engage the internal threads of the neck portion and force the seat memberv into place, said screwplug havinga head projecting above the casing when the seat member is in place, and constituting a manipulating member for inserting and removing the plugs by hand, the head of the plug projecting only slightly above the top ot the casing and being oi' less diameter than the latter,-wliereby the external threads of the neck may receive a pump coupling which encloses said head, the latter being adapted to make contact with the packing of said coupling, and said valve having a packing between said screw plug and said casing adapted to prevent leakage ot' air out around the screw plug during iniiation. i

3. A valve comprising a casing having an externally and internally threaded neck portion and an internal seating tace, a seat member comprising a plug wholly enclosed within said casing and having a packing fitting said seating face, and an independently rotatable screw plug swivelled to said seat member above the latter, and having threads adapted to engage the internal threads of the neck portion and torce the seat member into place, said screw plug having a head projecting above the casing when the seat member is in place, and constituting a manipulating member for inserting and removing the plugs by hand, the head of the plug projecting only slightly above the top of the casing and being ot' less diameter than the latter, whereby the eX- ternal threads ot' the neck may receive a pump coupling which encloses said head, the latter being adapted to make contact with the packing of said coupling andsaid valve having a packing between said screw plug and said casing adapted to prevent leakage of air out around the'screw plug during inflation, and said head being recessed or chamtered. n l

4. A pneumatic valve comprising a valve shell having two elongated internal conical seating faces, a screw plug-and a seat member entering said shell as a unit and provided with two correspondingly tapered packing rings adapted to seat equally against such conical seating faces, whereby to make a double air-tight joint, the tapered portions of said packing rings being substantially continuous within-the 'limits of movement. upon said tapered seats, whereby there-is no obstruction 'tov the movement of either oi"V said conical packing rings into wedging contact with the tapered seats.

5. A pneumatic valve comprising a valve shell having internal screw-threads and an elongated internal coned seat at. its'outer end beyond such screw-threads, and aninternal elongated conical seat intermediate its ends just beyond such screw-th`reads, a seat member inseparably connected with a screw plug externally threaded to engage the screw-threads, within the valve shell the seat member and screw plug having packing rings located respectively to seat only against said internal seats in the shell, sai'd packing rings being capable of li'i'nobstructed movement on said internal seats until stopped by the wedging tit or contact of said packing rings on said internal conical seats.

6. A pneumatic valve comprising a valve shell having two elongated internal conical seating faces, a seat member and va screw plug insertable and removable fromv said lOO shell as a unit and having two correspondingly tapered packing rings adapted to seat against such conical seating faces, whereby to make a double air-tight joint, the upper l packing ring being free from parts whichy 10 conical faces.

In witness whereof,v I have hereunto' signed my name in the presence of two subscriblng witnesses.`

HENRY P. KRAFT;

Witnesses: v

THOMAS F. WALLACE, FRED WHITE. 

